--- title: "Flat Roofing in Havant & Portsmouth | New Flat Roofs | S&S Roofing" description: "New and replacement flat roofs in Havant, Portsmouth and Hampshire — extensions, garages, dormers and outbuildings, laid to fall. 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You get a fixed written price, and it does not change unless the scope changes with your agreement." } }, { "@type": "Question", "name": "How long does a flat roof take to replace?", "acceptedAnswer": { "@type": "Answer", "text": "A typical garage, porch or single-storey extension roof is usually a short job of a few days rather than weeks, depending on the weather and whether the deck needs replacing. We give you the expected duration with the quote." } }, { "@type": "Question", "name": "How long does a flat roof last?", "acceptedAnswer": { "@type": "Answer", "text": "Modern flat roofing systems, correctly laid to fall with sound detailing, are a long-term covering rather than a stopgap, and typically far outlast the old three-layer felt they replace. Lifespan depends on the system chosen, the exposure and whether outlets are kept clear." } }, { "@type": "Question", "name": "Can my flat roof be repaired instead of replaced?", "acceptedAnswer": { "@type": "Answer", "text": "Sometimes. A single split in an otherwise sound covering on a firm deck can be repaired properly. Widespread blistering, a soft deck or standing water usually means a repair is money spent twice, and we will show you the photographs and let you decide." } }, { "@type": "Question", "name": "Why does water sit on my flat roof after it rains?", "acceptedAnswer": { "@type": "Answer", "text": "Either the roof was laid without enough fall or the deck has sagged between the joists. Ponding shortens the life of any covering, so correcting the fall with firrings is part of a proper replacement rather than an optional extra." } }, { "@type": "Question", "name": "Do you guarantee flat roofing work?", "acceptedAnswer": { "@type": "Answer", "text": "Yes. There is a workmanship guarantee, and the cover varies by job type, so the exact terms for your flat roof are confirmed in writing with your quote. Any manufacturer warranty on the system itself is separate and we will tell you what applies." } }, { "@type": "Question", "name": "Will you insulate the roof at the same time?", "acceptedAnswer": { "@type": "Answer", "text": "Where the space below is heated, we will specify insulation as part of the build-up so you get a warmer room as well as a dry one. On unheated garages and outbuildings it is usually unnecessary, and we will say so rather than sell it." } }, { "@type": "Question", "name": "Can you deal with a flat roof leak in an emergency?", "acceptedAnswer": { "@type": "Answer", "text": "Yes. The phone is answered 24 hours a day, seven days a week, and we can make a roof safe and watertight quickly before completing a permanent repair or replacement. An emergency call-out fee applies, starting at £50, and may vary with travel distance." } }, { "@type": "Question", "name": "Does a flat roof replacement need scaffold?", "acceptedAnswer": { "@type": "Answer", "text": "Ground-floor garage and extension roofs often need only edge protection or a tower; higher dormer and second-storey work usually needs scaffold. Whatever access is required is included in your quote so there are no separate bills to chase." } }, { "@type": "Question", "name": "Do you work on commercial flat roofs?", "acceptedAnswer": { "@type": "Answer", "text": "Yes. We work on commercial and industrial flat roofs across Havant, Portsmouth and the wider Hampshire and West Sussex area, phasing the work so the building stays watertight and in use throughout." } } ] } ] --- 24/7 emergency call-outs — Havant, Portsmouth & Hampshire 24/7 emergency call-outs [info@ssroofingbuilding.com](mailto:info@ssroofingbuilding.com)[07926 240983](tel:+447926240983) [![S&S Roofing & Building Limited logo](/__l5e/assets-v1/643b7b92-b643-4707-958b-dea225060a1f/logo.webp)](/) [Home](/)[About](/about) Services Service Areas [Our Work](/our-work)[Reviews](/reviews)[Contact](/contact)[07926 240983](tel:+447926240983)[Get a Free Quote](/contact) Flat roofing in Havant, Portsmouth & Hampshire # A flat roof that drains, seals and stays sealed through Hampshire winters Extensions, garages, dormers and outbuildings re-covered properly — decked, insulated where needed and laid to fall so water leaves the roof instead of sitting on it, all for one fixed written price. [Get My Free Fixed Quote](#quote)[07926 240983](tel:+447926240983) Family-run, owner-led roofing · free inspection with photographic report · £1,000,000 public liability insurance · workmanship guarantee confirmed in writing with your quote. 1. [Home](/) 2. [Roofing Services](/services) 3. Flat roofs Flat roofs we have completed ![New black EPDM flat roof installed on a domestic extension in Hampshire](/__l5e/assets-v1/baede46f-0dc0-4c3f-9411-472fbc6be9c4/flat-roofs-after-01.webp)![Finished flat roof covering with clean upstands on a house extension](/__l5e/assets-v1/c451bfb8-e345-4266-b63d-fb1a175eff48/flat-roofs-after-02.webp)![Close detail of a newly bonded flat roof membrane corner and trim](/__l5e/assets-v1/11de14a7-541f-42f9-866a-cfcf58d634c0/flat-roofs-after-03.webp)![Completed felt flat roof with clean upstands and perimeter drip trims, Hampshire (after)](/__l5e/assets-v1/7ddc8739-63ed-499a-9734-af2c3770e37d/flat-roofs-after-01-2.webp)![Completed felt flat roof with clean upstands and perimeter drip trims, Hampshire (after)](/__l5e/assets-v1/4b153e0f-04a4-49c7-b1fe-38c7f793d148/flat-roofs-after-02-2.webp)![Completed felt flat roof with clean upstands and perimeter drip trims, Hampshire (after)](/__l5e/assets-v1/cd9b7f2e-c450-4d3a-85a5-a885de035641/flat-roofs-after-03-2.webp) Team of 6 Owner-led flat and pitched roofing across Hampshire Laid to fall Every roof set up to drain, not to pond Free Inspection, photographic report and quote £1m Public liability insurance 24/7 Phone answered for flat roof emergencies What it is ## Flat roofs fail for two reasons: bad falls and bad detailing A flat roof is not flat. It is a shallow, deliberate slope with sealed upstands, edges and outlets. Get the fall and the details right and it is a long-lasting, low-maintenance covering. Most of the failed flat roofs we replace in Havant and Portsmouth are old three-layer felt on extensions, garages, dormers and bays. Felt of that generation goes brittle, blisters in summer and splits along the seams, and once a split opens the deck beneath starts absorbing water. Because the water spreads sideways under the covering, the damp patch inside is often nowhere near the split. The second failure is standing water. Where a roof was laid without adequate fall, or where the deck has sagged between joists, water sits after every shower. Ponding accelerates the breakdown of any covering, forces water into laps and joints, and adds weight to a structure that was not designed for it. We correct falls with firring or a tapered build-up rather than laying a new covering over the same puddle. We strip back to the deck so we can see what we are covering. Soft, delaminated or rotten boarding is replaced, the fall is checked and corrected, insulation is specified where the space below is heated, then the new covering is installed with properly formed upstands, drips, trims and outlets. Edges and junctions are where flat roofs leak, so that is where the time goes. You get photographs of the stripped deck before it disappears under the new covering, so you can see exactly what you paid for. The price is fixed in writing before we start, and nothing is added without your agreement. ### Who it is for Homeowners with a leaking extension, garage, porch, dormer or bay roof; anyone whose felt roof is blistered, split or ponding; landlords and businesses with flat-roofed outbuildings. ### When it is needed When water sits on the roof after rain, when felt has cracked, blistered or lifted at the edges, when the deck feels soft underfoot, or when a ceiling below is staining and repairs have stopped working. ### Why a professional matters Falls, upstand heights, drip edges and outlet detailing are what make a flat roof watertight. A covering rolled over a bad deck looks finished and leaks within a year or two. ### What is included Strip and disposal, deck inspection and repair, corrected falls, insulation where specified, new covering, trims and upstands, outlet connections, and a clean site at the end. What ignoring it costs ## A flat roof does not drip politely — it soaks the deck first By the time a flat roof shows a stain indoors, water has usually been travelling between the covering and the deck for months. The covering is the cheap part; the deck and the ceiling are not. ### The deck rots out Chipboard and ply absorb water and lose strength. A roof that could have been re-covered becomes a re-deck, and a soft deck is genuinely unsafe to walk on for inspection or maintenance. ### Damage reaches the room below Extension and dormer roofs sit directly over living space. Water gets into plasterboard, insulation, cornice and decoration, and in dormers it runs down inside the wall build-up before anyone sees it. ### Ponding compounds every fault Standing water works its way into every lap and joint, freezes and expands in winter, and adds weight to a deck that is already weakening. Each shower makes the next failure more likely. ### Mistakes we are called out to fix - Painting liquid sealant over blistered felt so the trapped moisture stays in the deck - Laying a new covering straight over the old one without correcting the fall - Using upstands that are too shallow where the roof meets a wall or a door threshold - Leaving a blocked outlet or gutter so the roof holds water permanently - Choosing the cheapest covering for a roof that gets walked on for window cleaning or maintenance - Ignoring the drip edge, so water runs back under the trim and rots the fascia Our process ## The same system on every flat roofing job we take on 1. 01 ### Inspection We check the covering, laps, upstands, outlets and the firmness of the deck, and look at the ceiling below for where water has been travelling. 2. 02 ### Diagnosis Photographs plus a straight answer on whether a repair is sensible or the roof needs stripping and re-covering, and what the deck is likely to need. 3. 03 ### Fixed written price An itemised quote covering strip, disposal, deck repair, falls, insulation if required, covering, trims and outlets, with a duration. 4. 04 ### Strip, deck and cover Old covering removed, deck repaired or replaced, falls corrected with firrings, then the new covering installed with fully formed edges and upstands. 5. 05 ### Test and hand over We check drainage with water, confirm outlets run clear, clear the site, send completion photographs and confirm your guarantee in writing. What you get ## Concrete outcomes, not vague promises ### It actually drains Corrected falls mean water leaves the roof within minutes of the rain stopping, which is the single biggest factor in how long any flat covering lasts. ### Seamless where it matters Upstands, drips and outlet details are formed rather than patched, because that is where flat roofs leak. Nothing relies on a bead of sealant to stay watertight. ### Warmer room below Where the space underneath is heated, insulation is built into the new roof so an extension or dormer stops being the coldest room in the house. ### Low maintenance A modern covering with clear outlets needs an occasional clear-out and a look-over, not annual repairs. We will tell you exactly what to check and when. ### No surprise costs The deck is inspected and quoted before we start, and anything unforeseen is photographed and agreed with you before a penny is added. ### Proof of what is underneath Photographs of the stripped and repaired deck mean you can see the part of the job that disappears from view forever once the covering goes on. In detail ## Coverings, decks and details for flat roofs that last The right covering depends on the size of the roof, whether it is walked on, what it abuts and how much movement the structure has. > “From start to finish, the service provided was excellent. It is clear that they take great pride in their work and genuinely care about making sure their customers are happy with the finished result. There was no pressure, and I felt confident that I was receiving genuine advice and a fair price. They were also respectful of the property and left everything clean and tidy once the work was finished.” > > Sarah WoolleyGoogle review ### High-performance felt systems Modern torch-on and self-adhesive membrane systems bear little resemblance to the brittle felt they replace. Laid in layers with fully sealed laps, correctly formed upstands and mineral cap sheets, they handle movement well, are economical over larger areas and are straightforward to repair locally in future if something is ever damaged. ### Single-ply and rubber membranes Single-ply and rubber systems suit garages, extensions and outbuildings where a large area can be covered with very few joints. Fewer seams means fewer potential failure points, and the sheets are dimensionally stable across the temperature swings a south-facing roof sees between a January night and an August afternoon. ### Liquid-applied systems Liquid coatings are the right answer on complicated roofs — plenty of pipes, upstands, rooflights or awkward junctions — because they seal around obstacles without needing a joint. They depend entirely on a clean, sound, correctly prepared substrate, which is why we strip and repair rather than coating over failing material. ### Decks and structure Plywood, OSB and older chipboard decks all behave differently once wet. We check firmness across the whole roof, not just at the leak, and replace what has softened. Where joists have sagged, correcting the fall with firring pieces is the difference between a roof that drains and one that ponds again in six months. ### Insulation and warm roofs Where the space below is heated, a warm-roof build-up places rigid insulation above the deck and beneath the covering, keeping the structure warm and dry and preventing interstitial condensation. Cold-roof construction still exists on older extensions and relies on ventilation instead. We specify to suit the building and explain which you have. ### Upstands, trims and outlets Upstands need adequate height where the roof meets a wall, a door threshold or a dormer cheek. Drip trims throw water clear of the fascia. Outlets and rainwater connections must be sized and positioned at the low point. These are unglamorous details, and they are the ones that decide whether the roof leaks. ### Green roofs, balconies and walkways Roofs that get walked on, hold planting or serve as a balcony need a covering rated for traffic or load, plus protection layers. Tell us how the roof will be used and it gets specified for that, rather than being covered with the same build-up as an unvisited garage. ### Residential and commercial flat roofing Domestic flat roofs are typically extensions, garages, dormers, porches and bays. Commercial flat roofs are larger, often with plant, pipework and multiple outlets, and usually need phasing so the building stays weathertight and open while the work runs. Both get the same fixed-price approach. Straight answers ## Flat roofing questions, answered Anything not covered here, call 07926 240983. You will speak to an owner, not a salesperson, at any hour of the day. How much does a new flat roof cost in Havant or Portsmouth?+ It depends on the area, the covering, the state of the deck and the access, so every flat roof is priced individually after a free inspection. You get a fixed written price, and it does not change unless the scope changes with your agreement. How long does a flat roof take to replace?+ A typical garage, porch or single-storey extension roof is usually a short job of a few days rather than weeks, depending on the weather and whether the deck needs replacing. We give you the expected duration with the quote. How long does a flat roof last?+ Modern flat roofing systems, correctly laid to fall with sound detailing, are a long-term covering rather than a stopgap, and typically far outlast the old three-layer felt they replace. Lifespan depends on the system chosen, the exposure and whether outlets are kept clear. Can my flat roof be repaired instead of replaced?+ Sometimes. A single split in an otherwise sound covering on a firm deck can be repaired properly. Widespread blistering, a soft deck or standing water usually means a repair is money spent twice, and we will show you the photographs and let you decide. Why does water sit on my flat roof after it rains?+ Either the roof was laid without enough fall or the deck has sagged between the joists. Ponding shortens the life of any covering, so correcting the fall with firrings is part of a proper replacement rather than an optional extra. Do you guarantee flat roofing work?+ Yes. There is a workmanship guarantee, and the cover varies by job type, so the exact terms for your flat roof are confirmed in writing with your quote. Any manufacturer warranty on the system itself is separate and we will tell you what applies. Will you insulate the roof at the same time?+ Where the space below is heated, we will specify insulation as part of the build-up so you get a warmer room as well as a dry one. On unheated garages and outbuildings it is usually unnecessary, and we will say so rather than sell it. Can you deal with a flat roof leak in an emergency?+ Yes. The phone is answered 24 hours a day, seven days a week, and we can make a roof safe and watertight quickly before completing a permanent repair or replacement. An emergency call-out fee applies, starting at £50, and may vary with travel distance. Does a flat roof replacement need scaffold?+ Ground-floor garage and extension roofs often need only edge protection or a tower; higher dormer and second-storey work usually needs scaffold. Whatever access is required is included in your quote so there are no separate bills to chase. Do you work on commercial flat roofs?+ Yes. We work on commercial and industrial flat roofs across Havant, Portsmouth and the wider Hampshire and West Sussex area, phasing the work so the building stays watertight and in use throughout. Related work ## Other things we do on the same roof [ ### Roof repairs Read more ](/services/roof-repairs)[ ### Fascias & guttering Read more ](/services/fascias-and-guttering)[ ### Re-roofs Read more ](/services/re-roofs) See every service on our [roofing services](/services) page, read about the family behind the firm on our [about page](/about), or head back to the [homepage](/). Where we work ## Flat roofing across Hampshire - Havant - Emsworth - Rowlands Castle - Portsmouth - Southbourne - Southampton - Chichester - Hampshire - West Sussex [View service areas](/service-areas) Free quote ## Stop the extension leaking and get a flat roof that drains properly Send your details and we will inspect the covering and the deck free of charge, photograph what we find, and give you a fixed written price for a flat roof laid to fall and detailed properly. - Free inspection and free quote, no obligation - Photographic report of the actual condition - Fixed written price, cash or bank transfer - Workmanship guarantee, varies by job type - £1,000,000 public liability insurance [Call 07926 240983](tel:+447926240983)[Contact page](/contact) S&S Roofing & Building Limited 13 Braishfield Rd, Havant, Hampshire PO9 2HS, UK Open 24 hours, 7 days a week ![S&S Roofing & Building Limited logo](/__l5e/assets-v1/643b7b92-b643-4707-958b-dea225060a1f/logo.webp) A family-run roofing company based in 13 Braishfield Rd, Havant, Hampshire PO9 2HS, UK, led by Tommy-Davey Stevens and Jordan Jay Stevens, with a 6-strong team on every job. £1,000,000 public liability · Workmanship guarantee (varies by job type) ### Roofing services - [Re-roofs in Havant & Portsmouth](/services/re-roofs) - [Roof repairs in Havant & Portsmouth](/services/roof-repairs) - [Flat roofs in Havant & Portsmouth](/services/flat-roofs) - [Fascias & guttering in Havant & Portsmouth](/services/fascias-and-guttering) - [Roof maintenance in Havant & Portsmouth](/services/roof-maintenance) - [Chimney work in Havant & Portsmouth](/services/chimney-work) - [Leadwork in Havant & Portsmouth](/services/leadwork) - [Moss removal & roof cleaning in Havant & Portsmouth](/services/moss-removal) - [Photographic reports in Havant & Portsmouth](/services/photographic-reports) - [Drone surveys in Havant & Portsmouth](/services/drone-surveys) ### Areas covered - [Roofers in Havant](/service-areas/havant) - [Roofers in Emsworth](/service-areas/emsworth) - [Roofers in Rowlands Castle](/service-areas/rowlands-castle) - [Roofers in Portsmouth](/service-areas/portsmouth) - [Roofers in Southbourne](/service-areas/southbourne) - [Roofers in Southampton](/service-areas/southampton) - [Roofers in Chichester](/service-areas/chichester) - [Roofers in Hampshire](/service-areas/hampshire) - [Roofers in West Sussex](/service-areas/west-sussex) ### Contact - [07926 240983](tel:+447926240983) - [info@ssroofingbuilding.com](mailto:info@ssroofingbuilding.com) - Open 24 hours, 7 days a week - [Follow us on Facebook](https://www.facebook.com/SSRoofingbuilding) - [Follow us on Instagram](https://www.instagram.com/snsroofing_ltd/) © 2026 S&S Roofing & Building Limited. 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